Salt makes water boil at a higher
temperature - water sticks to the salt ions,
so they can't get out of the liquid as easily.
Salt makes water freeze at a lower
temperature - it's probably harder for the
water molecules to get organized into a solid
state with all the salt ions messing up its
I figured salt would also lower the temperature
of water, because the water molecules sticking to
the salt ions wouldn't be able to move around as
fast, but I didn't know, and the stuff on google
seemed to be about freezing and boiling, so I
did an experiment:
I put water in a glass, and it was 70 deg
Fahrenheit. I added a bunch of salt and the
temperature dropped immediately to 68 degrees
Fahrenheit. I stirred and stirred and the
temperature stayed at 68 deg F. So, indeed,
salt lowers the temperature of liquid water.
When I took the digital thermometer out of the
water, the temperature fell lower and lower - the
evaporating water was cooling the thermometer!